/* ============================================
   鸽子笼 · 作品集
   设计语言：极简留白 + 纸本质感 + 克制动效
   ============================================ */

:root {
  --bg:        #f6f3ec;
  --bg-soft:   #efeadd;
  --ink:       #1a1a1a;
  --ink-soft:  #4a4a4a;
  --ink-mute:  #8a8a82;
  --line:      #d8d2c2;
  --accent:    #b8451f;
  --accent-2:  #2c4a3e;
  --radius:    14px;
  --radius-sm: 8px;
  --shadow-1:  0 1px 2px rgba(26,26,26,.04), 0 4px 12px rgba(26,26,26,.04);
  --shadow-2:  0 6px 24px rgba(26,26,26,.08), 0 2px 6px rgba(26,26,26,.04);
  --ease:      cubic-bezier(.2, .7, .2, 1);
  --ease-out:  cubic-bezier(.16, 1, .3, 1);
  --font-serif: 'Noto Serif SC', serif;
  --font-sans:  'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --font-mono:  'JetBrains Mono', monospace;
}

*, *::before, *::after { box-sizing: border-box; }

html {
  overflow-x: hidden;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  cursor: default;
}

a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }

/* 极淡噪点，强化纸面 */
.grain {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  opacity: .35;
  mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='200' height='200'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0.1 0 0 0 0 0.1 0 0 0 0 0.1 0 0 0 0.4 0'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
}

/* 鼠标光晕 */
.cursor-glow {
  position: fixed;
  top: 0; left: 0;
  width: 520px;
  height: 520px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(184,69,31,.10) 0%, rgba(184,69,31,0) 60%);
  pointer-events: none;
  z-index: 2;
  transform: translate(-50%, -50%);
  transition: opacity .3s var(--ease);
  opacity: 0;
  will-change: transform;
}
body:hover .cursor-glow { opacity: 1; }

/* ====== Header ====== */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 40px;
  background: rgba(246, 243, 236, 0);
  backdrop-filter: blur(0px);
  -webkit-backdrop-filter: blur(0px);
  transition: background .4s var(--ease), backdrop-filter .4s var(--ease), -webkit-backdrop-filter .4s var(--ease), border-color .4s var(--ease);
  border-bottom: 1px solid transparent;
}
.site-header.is-scrolled {
  background: rgba(246, 243, 236, 0.78);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom-color: var(--line);
}
.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 17px;
  letter-spacing: 0.02em;
  color: var(--ink);
  transition: opacity .2s var(--ease);
}
.brand:hover { opacity: .7; }
.brand__name {
  font-family: var(--font-serif);
  font-weight: 600;
  letter-spacing: 0.02em;
}
.brand__sub {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-mute);
  letter-spacing: 0.05em;
  margin-left: 2px;
}
.brand__mark {
  display: inline-block;
  transition: transform .6s var(--ease-out);
}
.brand:hover .brand__mark { transform: rotate(-12deg) translateY(-2px); }

.site-nav {
  display: flex;
  align-items: center;
  gap: 28px;
  font-size: 14px;
  color: var(--ink-soft);
}
.site-nav a {
  position: relative;
  padding: 4px 0;
  transition: color .2s var(--ease);
}
.site-nav a::after {
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: right;
  transition: transform .35s var(--ease-out);
}
.site-nav a:hover { color: var(--ink); }
.site-nav a:hover::after { transform: scaleX(1); transform-origin: left; }
.site-nav a.site-nav__ghost {
  color: var(--ink-mute);
  font-size: 13px;
  padding: 6px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  transition: all .2s var(--ease);
}
.site-nav a.site-nav__ghost:hover {
  color: var(--ink);
  border-color: var(--ink);
  transform: translateY(-1px);
}
.site-nav a.site-nav__ghost::after { display: none; }

/* ====== Hero ====== */
.hero {
  position: relative;
  z-index: 3;
  max-width: 1080px;
  margin: 0 auto;
  padding: 160px 40px 60px;
}
.hero__eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.3em;
  color: var(--ink-mute);
  margin: 0 0 24px;
}
.js .hero__eyebrow {
  opacity: 0;
  transform: translateY(12px);
}
.hero__title {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(32px, 5.2vw, 60px);
  line-height: 1.25;
  letter-spacing: 0.01em;
  margin: 0 0 20px;
  color: var(--ink);
}
.hero__line {
  display: block;
  overflow: hidden;
}
.hero__sub {
  font-size: 15px;
  color: var(--ink-soft);
  line-height: 1.8;
  margin: 0;
  max-width: 520px;
}
.js .hero__sub {
  opacity: 0;
  transform: translateY(12px);
}

/* ====== Section head ====== */
.section-head {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 40px 28px;
}
.section-title {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(28px, 3.5vw, 42px);
  margin: 0 0 12px;
  display: flex;
  align-items: baseline;
  gap: 16px;
  flex-wrap: wrap;
}
.section-title__cn {
  color: var(--ink);
  letter-spacing: 0.05em;
}
.section-title__en {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ink-mute);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  font-weight: 400;
}
.section-desc {
  color: var(--ink-soft);
  font-size: 15px;
  margin: 0;
  max-width: 560px;
}

/* ====== Works grid ====== */
.works {
  position: relative;
  z-index: 3;
  padding: 20px 0 80px;
}
.grid {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 40px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 32px;
  min-height: 240px;
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--ink);
  overflow: hidden;
  transition: transform .5s var(--ease-out), box-shadow .5s var(--ease-out), border-color .4s var(--ease);
  will-change: transform;
  transform-style: preserve-3d;
}
.js .card {
  opacity: 0;
  transform: translateY(20px);
}
.js .card.is-in {
  opacity: 1;
  transform: translateY(0);
  transition: opacity .8s var(--ease-out), transform .8s var(--ease-out), box-shadow .5s var(--ease-out);
}
.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-2);
  border-color: transparent;
}
.card__tags {
  position: absolute;
  top: 16px; right: 16px;
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  justify-content: flex-end;
}
.card__tag {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  padding: 3px 8px;
  border-radius: 999px;
  white-space: nowrap;
  color: var(--ink-mute);
  background: rgba(138, 138, 130, 0.1);
}
.card__tag--accent {
  color: var(--accent);
  background: rgba(184, 69, 31, 0.1);
}
.card__note {
  font-size: 12px;
  color: var(--ink-mute);
  font-style: italic;
  margin: -8px 0 16px;
  opacity: 0.7;
}
.card__icon {
  width: 48px;
  height: 48px;
  margin-bottom: 20px;
  color: var(--ink);
  transition: transform .5s var(--ease-out), color .4s var(--ease);
}
.card__icon svg { width: 100%; height: 100%; }
.card:hover .card__icon {
  transform: translateY(-3px) rotate(-4deg);
  color: var(--accent);
}

/* 状态：制作中 / 已归档 */
.card--wip.is-in { opacity: .75; }
.card--archived.is-in { opacity: .55; }

.card__title {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 22px;
  margin: 0 0 12px;
  letter-spacing: 0.02em;
}
.card__desc {
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
  margin: 0 0 24px;
  flex: 1;
}
.card__foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-mute);
  letter-spacing: 0.05em;
  padding-top: 16px;
  border-top: 1px dashed var(--line);
}
.card__link {
  color: var(--ink);
  transition: transform .25s var(--ease), color .25s var(--ease);
  display: inline-block;
}
.card:hover .card__link {
  color: var(--accent);
  transform: translateX(4px);
}

/* 卡片悬停光斑 */
.card__sheen {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(
    400px circle at var(--mx, 50%) var(--my, 50%),
    rgba(255, 255, 255, 0.6),
    transparent 40%
  );
  opacity: 0;
  transition: opacity .4s var(--ease);
}
.card:hover .card__sheen { opacity: 1; }

/* 精选卡 */
.card--feature {
  grid-column: 1 / -1;
  background: linear-gradient(135deg, var(--bg-soft) 0%, #ebe4d0 100%);
}
.card--feature .card__title { font-size: 28px; }
.card--feature .card__desc { font-size: 15px; max-width: 720px; }

/* ====== Footer ====== */
.site-footer {
  position: relative;
  z-index: 3;
  padding: 36px 40px 44px;
  text-align: center;
  border-top: 1px solid var(--line);
  font-size: 13px;
  color: var(--ink-mute);
  background: var(--bg);
}
.site-footer p { margin: 4px 0; }
.site-footer__row a {
  color: var(--ink-soft);
  transition: color .2s var(--ease);
}
.site-footer__row a:hover { color: var(--accent); }
.site-footer__row .sep {
  margin: 0 10px;
  color: var(--ink-mute);
  opacity: .5;
}
.site-footer__small {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
  opacity: .6;
  margin-top: 8px;
}

/* ====== Reveal 动效初始态 ====== */
.js [data-reveal] { opacity: 0; transform: translateY(14px); }
.js [data-reveal].is-in {
  opacity: 1;
  transform: translateY(0);
  transition: opacity .9s var(--ease-out), transform .9s var(--ease-out);
}
.js [data-split] .char {
  display: inline-block;
  opacity: 0;
  transform: translateY(100%);
  transition: opacity .8s var(--ease-out), transform .8s var(--ease-out);
}
[data-split].is-in .char {
  opacity: 1;
  transform: translateY(0);
}

/* ====== 减少动效偏好 ====== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    transition-duration: .01ms !important;
  }
  .js [data-reveal], .js [data-split] .char, .js .card { opacity: 1; transform: none; }
  .cursor-glow { display: none; }
}

/* ====== 响应式 ====== */
@media (max-width: 720px) {
  .grid { grid-template-columns: 1fr; }
  .card--feature { grid-column: auto; }
  .card--feature .card__title { font-size: 22px; }
  .site-header { padding: 16px 20px; }
  .site-nav { gap: 16px; }
  .site-nav a.site-nav__ghost { display: none; }
  .hero { padding: 130px 20px 40px; }
  .section-head, .grid { padding-left: 20px; padding-right: 20px; }
  .works { padding-top: 20px; padding-bottom: 50px; }
  .card { padding: 24px; min-height: 200px; }
  .site-footer { padding: 28px 20px 36px; }
}